This Product:

This shirt is an excellent base layer under a FR shirt, pretty much all long sleeved. It keeps you cool and dry. The fit is true, and definitely do not order smaller than your true size. It is close to the skin without being uncomfortable. The only minor complaint I might have is that most FR clothing states somewhere on the garment it is FR, and supply very specific laundering instructions. I trust it is FR since the Working Persons website, along with the UnderArmour website say it is FR, but there is no indication on the actual garment or the tags.